docs: def latex_output_graph(self, node):
      """
      Output the graph for LaTeX.  This will insert a PDF.
      """
      graph = node['graph']
      parts = node['parts']
  
      graph_hash = get_graph_hash(node)
      name = "inheritance%s" % graph_hash
      dest_path = os.path.abspath(os.path.join(setup.app.builder.outdir, '_images'))
      if not os.path.exists(dest_path):
          os.makedirs(dest_path)
      pdf_path = os.path.abspath(os.path.join(dest_path, name + ".pdf"))
  
      graph.run_dot(['-Tpdf', '-o%s' % pdf_path],
                    name, parts, graph_options={'size': '"6.0,6.0"'})
      return '\n\\includegraphics{%s}\n\n' % pdf_path